unsigned char checksum(unsigned char *data, size_t length) { unsigned char checksum = 0; for(int i = 0; i < length; i++) { checksum ^= data[i]; } return checksum; }

unsigned char checksum(unsigned char *data, size_t length) {
    unsigned char checksum = 0;
    for(int i = 0; i < length; i++) {
        checksum ^= data[i];
    }
    return checksum;
}